Heterojunction solar cell with passivated emitter surface

摘要

A high-efficiency heterojunction solar cell wherein a thin emitter layer (preferably Ga0.52In0.48P) forms a heterojunction with a GaAs absorber layer. A passivating window layer of defined composition is disposed over the emitter layer. The conversion efficiency of the solar cell is at least 25.7%. The solar cell preferably includes a passivating layer between the substrate and the absorber layer. An anti-reflection coating is preferably disposed over the window layer.